Angles of Triangles

Front

What is the sum of the interior angles of a triangle?

Back

The sum of the interior angles of a triangle is always 180°.

Front

If one angle of a triangle is 90°, what type of triangle is it?

Back

It is a right triangle.

Front

What is the measure of the third angle if two angles of a triangle are 50° and 60°?

Back

The third angle measures 70° (180° - 50° - 60° = 70°).

Front

What is the relationship between the angles in an isosceles triangle?

Back

In an isosceles triangle, the angles opposite the equal sides are equal.

Front

If two angles of a triangle are 45° each, what is the type of triangle?

Back

It is an isosceles triangle.

Front

What is the measure of an exterior angle of a triangle?

Back

The measure of an exterior angle is equal to the sum of the two opposite interior angles.

Front

If the angles of a triangle are in the ratio 2:3:4, what are the measures of the angles?

Back

The angles measure 40°, 60°, and 80°.

Front

What is the formula to find the missing angle in a triangle?

Back

The formula is: Missing angle = 180° - (sum of the other two angles).

Front

What is the definition of complementary angles?

Back

Complementary angles are two angles whose sum is 90°.

Front

What is the definition of supplementary angles?

Back

Supplementary angles are two angles whose sum is 180°.